Colour

#FF0000

#FF0000
Red
Dark
Named: Red

#FF0000 is the CSS colour red with RGB values 255, 0, 0 and HSL 0°, 100%, 50%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF0000#FF0000

HEX#FF0000

HEX (short)#F00

RGBrgb(255, 0, 0)

RGB (0–1)1, 0, 0

RGB percentages100%, 0%, 0%

HSLhsl(0, 100%, 50%)

HSV / HSBhsv(0, 100%, 100%)

CMYK0%, 100%, 100%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,711,680

CSS custom property--colour: #FF0000;

Brightness & contrast

Relative luminance0.2126WCAG 2.x, 0 is black and 1 is white

Perceived brightness139.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.25:1

Contrast with white4:1WCAG normal text: Fail

Contrast with black5.25:1WCAG normal text: AA

Greyscale equivalent#363636

Inverted#00FFFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6D5F00no red cones; affects about 1% of men; ΔE 86.9 from the original

Deuteranopia#A39000no green cones; the most common form, about 1% of men; ΔE 85.8 from the original

Tritanopia#FF000Fno blue cones; rare, and affects men and women equally; ΔE 3.7 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text4:1WCAG large text: AA

Contrast with black, large text5.25:1WCAG large text: AAA

Named colours

Red · ΔE 0 Orange red · ΔE 13.2 Tomato · ΔE 31.7 Crimson · ΔE 35.4 Firebrick · ΔE 40.7 Coral · ΔE 42.3

This is a named CSS colourRed (#FF0000)exact match

Hue familyred

CSS keyword usablered

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#00FFFF

Analogous#FF0080, #FF8000

Triadic#00FF00, #0000FF

Split complementary#00FF80, #0080FF

Tetradic#80FF00, #00FFFF, #8000FF

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FFCCCC

Lighter +30%#FF9999

Lighter +20%#FF6666

Lighter +10%#FF3333

Darker −10%#CC0000

Darker −20%#990000

Darker −30%#660000

Darker −40%#330000

More saturated +25%#FF0000

Less saturated −25%#DF2020

Channel breakdown

R255

Red255 (100%)

Green0 (0%)

Blue0 (0%)

Hue0°

Saturation (HSL)100%

Lightness50%

Dominant channelRed

Hex per channelR FF · G 00 · B 00

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#FF0000

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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